Who is responsible for line changes

Do the players deserve the blame for this problem or does Lewis bear the brunt? Once again last night they looked like a beer league team trying to change. Glenn Healy on TSN pointed out during that delayed penalty when Thomas came to the bench that one of the linsemen actually pointed out to one of the Bruin players that they only had 4 players on the ice for a few seconds. He sarcasticly said, " Ahh, you guys know you are allowed 6 players?" Even if Healy was exaggerating , there is no doubt it has been a huge problem all year. Hence the million too many men pims. If Lewis is too inept shouldn't our " leaders" like Chara & Savard take the bull by the horns and make sure these guys have their head in the game and stop making changes like a junior B team? I realize there are many new faces here, but come on. They have all played hockey long enough to know they can't keep making the same stupid mental mistakes. When you hear people talking about, doing the small things to win, I'm pretty sure these type of things are exactly what they are talking about. If this really is Lewis' fault , then its enough reason all by itself to can him.